Thumb brace



FIG. 1 is a top, front and right side perspective view of a thumb brace showing my new design;

FIG. 2 is a bottom, rear and left side perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is a perspective view showing the thumb brace in an alternative position.

The broken lines in the drawings illustrate portions of the thumb brace which form no part of the claimed design. 

CLAIM The ornamental design for a thumb brace, as shown and described. 